- baseSomething from which other things extend; a foundation.
- basisA physical base or foundation.
- abasiaAn inability to walk due to a defect in muscular coordination.
- basiceriteThe second joint of the antennae of crustaceans.
- basidiumA small structure, shaped like a club, found in the Basidiomycota division of fungi, that bears four spores at the tips of small projections.
- basophobiaInability to walk or stand erect, due to emotional causes.